User description

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Description

• Update CKV_AZURE_15 (Minimum TLS version for App Services and Function Apps) to permit 1.3 as a value for site_config.minimum_tls_version in addition to the existing check for 1.2.
• Update CKV_AZURE_154 (Minimum TLS version for App Service Slots) to permit 1.3 as a value for site_config.minimum_tls_version in addition to the existing check for 1.2.
• Update unit tests for both of the above.

Fix

Fixes #6954

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my feature, policy, or fix is effective and works
• New and existing tests pass locally with my changes

Generated description

Below is a concise technical summary of the changes proposed in this PR:

Updates the AppServiceMinTLSVersion and AppServiceSlotMinTLS checks to accept TLS 1.3 as a valid minimum TLS version for Azure web apps and web app slots. Modifies the check names to reflect the new acceptance criteria and updates the corresponding unit tests to validate the changes.